Abstract

A considerable proportion of individuals suffering from headache were classified as probable migraine, which is fulfilling all but one criterion for migraine. In the continuum severity theory, the mild end is thought to be tension type headache which transform into migraine with increasing severity of condition and the gray zone of headache occupies the middle ground of the continuum. Because of dichotomous diagnostic criteria between migraine and tension type headache, the position of probable migraine also could be located at this gray zone.